For a first time Android user looking to customize his phone, XDA-Dev can be filled with a lot of jargon. Hope this helps users understand at least a part of it.
Bootloader a.k.a HBoot
This is the piece of software that runs before anything else on the phone. It basically packages it all up, tells what to run in what order etc. Every computer device has a bootloader in some form or another, be it an Android Phone, iPhone, Windows PC, iMac etc. The HBoot is accessible by switching your phone off, then holding down volume down as you